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Human Diseases - Malaria (Class - XII)

Description: Proteins
Number of Questions: 15
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Tags: Malariae Protozoal Diseases
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Which is the deadliest malaria-causing agent?

  1. P. vivax

  2. P. falciparum

  3. P. ovale

  4. P. malariae


Correct Option: B
Explanation:

P. falciparum is the deadliest malaria-causing agent. It is responsible for 85% of malaria cases.

The high virulence of P. falciparum can be attributed to

  1. high possibility of drug resistance

  2. formation of merozoites

  3. its tendency to infect large proportion of the RBC

  4. the fact that mosquitoes are the most favourable definitive host


Correct Option: C
Explanation:

P. falciparum has the tendency to infect large proportion of RBC. Patients infected with P. falciparum species will exhibit ten times the number of parasites per cubic millimetre of blood than the patients infected with the other three malaria species.

Which of the following forms of malarial parasite infect humans?

  1. Merozoites

  2. Sporozoites

  3. Gametocytes

  4. Hypnozoites


Correct Option: B
Explanation:

The humans acquire malarial parasite in the form of sporozoites which are haploid cells.

Natural resistance to malaria is observed in patients of

  1. thalassemia

  2. magaloblastic anemia

  3. sickle cell anemia

  4. pernicious anemia


Correct Option: C
Explanation:

The patients of sickle cell anemia are naturally resistant to malaria. It is probably by microRNAs entering the parasite and tampering with its genome according to the latest research OR it may be due to smaller numbers of P. falciparum being able to infect sickled cells due to their shapes and increased rates of phagocytosis of infected sickled cells.

Most of the anti-malarial drugs act only when

  1. parasites are released outside by hepatocytes in the plasma

  2. the parasite is living inside RBCs

  3. parasites are in merozoite form inside the liver

  4. sporozoites are outside liver


Correct Option: B
Explanation:

Most of the malarial drugs like chloroquine, primaquine, etc. destroy the malarial parasites while they are living inside red blood cells.

The mating of the Apicomplexan gametocyte takes place in

  1. salivary gland of the mosquito

  2. blood cells of the humans

  3. gut of the mosquito

  4. liver of the humans


Correct Option: C
Explanation:

Mating of the gametocytes takes place in the gut of mosquito. After mating, the resultant embryo embed themselves in the mosquito’s gut, where they mature after 9 to 14 days into oocysts.

Which form of malarial parasite enters the gut of mosquito when it bites a human?

  1. Merozoite

  2. Gametocyte

  3. Trophozoite

  4. Ookinete


Correct Option: B
Explanation:

The malarial parasite enters the gut of mosquito in the form of gametocyte. These will mate only when they enter the gut of another mosquito that bites the infected person.

The embryonic form of malarial parasite is known as

  1. oocyst

  2. ookinete

  3. sporozoite

  4. schizont


Correct Option: B
Explanation:

The embryonic form of malarial parasite is known as ookinetes. These embed themselves in the mosquito’s gut, where they mature after 9 to 14 days into oocysts.

Which of the following malarial parasites has the longest erythrocytic cycle?

  1. P. ovale

  2. P. knowlesi

  3. P. malariae

  4. P. vivax


Correct Option: C
Explanation:

P. malariae has the longest erythrocytic cycle. It is of 72 hours.

The first resistant malarial parasite emerged in 1957. This parasite was resistant to

  1. chloroquine

  2. mefloquine

  3. sulfadoxine–pyrimethamine

  4. coartem


Correct Option: A
Explanation:

The first resistant malarial parasite was resistant to chloroquine. It was reported in Thailand in 1957.

In which form does malarial parasite exist in dormant state?

  1. Trophozoite

  2. Merozoite

  3. Hypnozoite

  4. Sporozoite


Correct Option: C
Explanation:

Hypnozoite is the dormant state of malarial parasite, latent hypnozoites may rest undetected in the liver for up to 30 years.

Which of the following is/are first invaded by a malarial parasite?

  1. Spleen

  2. Blood cells

  3. Liver

  4. Pancreas


Correct Option: C
Explanation:

Liver is the first organ invaded by a malarial parasite. Malarial parasites enter human body as sporozoites and are carried to the liver where they mature into forms known as schizonts. Over the next one to two weeks, each schizont multiplies into thousands of other forms known as merozoites. The merozoites break out of the liver and re-enter the bloodstream.

Which of the following was the first vaccine developed against plasmodium falciparum?

  1. Attenuated plasmodium falciparum vaccine

  2. Recombinant vaccine

  3. Anti-disease vaccine

  4. Altruistic vaccine


Correct Option: B
Explanation:

The first malaria vaccine to be approved was RTS,S (brand name Mosquirix), which was a recombinant vaccine engineered to express P. falciparum proteins capable of stimulating antibody production against the parasite.

P. falciparum can affect

  1. liver

  2. kidney

  3. brain

  4. All of these


Correct Option: D
Explanation:

P. falciparum causes severe malaria and affects brain, liver and kidney.

Black water fever is caused due to infection by

  1. P. malariae

  2. P. falciparum

  3. P. ovale

  4. P. vivax


Correct Option: B
Explanation:

Black water fever (BWF) is a severe clinical syndrome, characterised by intravascular hemolysis, hemoglobinuria (with passage of black urine), and acute renal failure caused by a variety of factors in patients with P. falciparum infestation.

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